Muscles spasm?: You could have a muscles spasm or perhaps a problem with your temperomandibular joint. This is the joint that moves the lower jaw. Give it a few days and see if it resolves on its own. If not see your dentist.
Answered 1/16/2013
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Or..: It might also be a swelling of the parotid salivary gland. I also suggest seeing a dentist if it is not gone in a few days.
Answered 3/21/2015
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